This 64GB PRO+ UHS-I microSDXC Memory Card from Samsung holds 64GB of data. Its Ultra High Speed Class 1 (UHS-I) bus interface enables it to achieve maximum read and write speeds of 100 MB/s and 90 MB/s respectively, which are far greater than the 30 MB/s minimum speeds guaranteed by the UHS Class 3 rating. This microSDXC card is suited for 4K content, Full-HD video recordings, and high-resolution pictures. A microSD adapter is included, allowing you to use the card in a full-size SDHC/SDXC slot. 64GB CapacityUHS-I / U3 / Class 10Max. Read Speed: 100 MB/sMax. Write Speed: 90 MB/sWater / X-Ray / Magnet ProofmicroSD Adapter Included